21m per second. Take 210 divided by 10. Hope this helps!
D because gamma rays and ultra violet rays are one of the examples of the three ways to transfer heart which is convection, radiation, and conduction.
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*It's nucleas. There are protons, neutrons and electrons.
Atoms have an overall charge that is neutral because atoms have equal number of positive protons and negative electrons thus they cancel each other out. This always true for atoms that are stable and in equilibrium.
